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To a mixture of 1.0 ml. of nitromethane and 5 ml. of dry dimethylformamide was added 53 mg. of a 50% dispersion of sodium hydride in mineral oil (1.1 mmole hydride). After 1 hour at room temperature, under nitrogen, 489 mg. (1.0 mmole) of 7-chloro-2-di-(morpholino)phosphinyloxy-5-phenyl-3H-1,4-benzodiazepine was added. After stirring at room temperature for 2 hours, dimethylformamide was evaporated (about 80°). The residue was partitioned between methylene chloride and an aqueous layer which is acidified with a slight excess of acetic acid. The methylene chloride layer was dried (Na2SO4) and evaporated. Separation of the product mixture by preparative tlc (silica gel, developed in 10% methanol in ethylacetate v/v) afforded pure final product, which upon crystallization from methanol, had a m.p. of 178°-180°.

1. additionTo a mixture of 1.0 ml
2. customdimethylformamide was evaporated (about 80°)
3. customThe residue was partitioned between methylene chloride
4. dry with materialThe methylene chloride layer was dried (Na2SO4)
5. customevaporated
6. customSeparation of the product mixture by preparative tlc (silica gel